Flip --enable-apps-show-on-first-paint flag.

apps/app_window_contents.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "apps/app_window_contents.h"
 
 #include "apps/ui/native_app_window.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/common/extensions/api/app_window.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 77 matching lines @@
                                            "updateAppWindowProperties",
                                            args,
                                            false));
 }
 
 void AppWindowContentsImpl::NativeWindowClosed() {
   content::RenderViewHost* rvh = web_contents_->GetRenderViewHost();
   rvh->Send(new ExtensionMsg_AppWindowClosed(rvh->GetRoutingID()));
 }
 
+void AppWindowContentsImpl::NativeWindowFirstShown() const {
+  base::ListValue args;
+  content::RenderViewHost* rvh = web_contents_->GetRenderViewHost();
+  rvh->Send(new ExtensionMsg_MessageInvoke(rvh->GetRoutingID(),
+                                           host_->extension_id(),
+                                           "app.window",
+                                           "appWindowFirstShown",
+                                           args,
+                                           false));
+}
+
 content::WebContents* AppWindowContentsImpl::GetWebContents() const {
   return web_contents_.get();
 }
 
 void AppWindowContentsImpl::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   switch (type) {
     case content::NOTIFICATION_RENDER_VIEW_HOST_CHANGED: {
@@ skipping 47 matching lines @@
     content::RenderViewHost* rvh) {
   DCHECK(rvh);
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,
       base::Bind(&content::ResourceDispatcherHost::BlockRequestsForRoute,
                  base::Unretained(content::ResourceDispatcherHost::Get()),
                  rvh->GetProcess()->GetID(), rvh->GetRoutingID()));
 }
 
 }  // namespace apps